@Con-Hennekens
you are right, the navi software cannot help to avoid it but it can help to find a way around it. Calimoto and Scenic for instance allow you to stop at the unexpected closure, tell the app:
- The route is closed here
- It closed for 1, 2, 5, 10, 20 kilometers
It will take this distance into account to find a way around this closed part of the road --> no random try&error forcing the App to finally re-calculate in a meaningful way.
MRA does constantly try to guide me back to my route as this is likely the best route to the next and may be nex+1 shaping point.